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Fuzzy self-tuning PID control algorithm for interleaved parallel bidirectional DC/DC converter

A technology of control algorithm and fuzzy controller, which is applied in the direction of control/regulation system, conversion of DC power input to DC power output, instruments, etc., can solve the problems of complex fuzzy rules and proportional coefficient correction, difficult control effect to meet expectations, etc., to achieve Fast dynamic response, improved static performance, and high current tracking accuracy

Active Publication Date: 2021-06-22
HARBIN INST OF TECH AT WEIHAI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fuzzy control has the above advantages, the main problem in its application is that the correction of fuzzy rules and proportional coefficients is relatively complicated, and if the adjustment is not proper, the control effect is difficult to achieve the expected

Method used

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  • Fuzzy self-tuning PID control algorithm for interleaved parallel bidirectional DC/DC converter
  • Fuzzy self-tuning PID control algorithm for interleaved parallel bidirectional DC/DC converter
  • Fuzzy self-tuning PID control algorithm for interleaved parallel bidirectional DC/DC converter

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0073] Specific implementation mode one: the following combination figure 1 and figure 2 Explain the establishment process of the small-signal model of the interleaved parallel bidirectional DC / DC converter. The bidirectional DC / DC converter is obtained by parallel connection of two sets of synchronous four-switch Buck-Boost converters. According to the different directions of energy flow on both sides of the converter, the converter Can work in Buck mode and Boost mode respectively.

[0074] (1) When the bidirectional DC / DC converter works in the interleaved parallel Boost state, VT 1 and VT 5 stay on, VT 2 and VT 6 remains off, VT 3 and VT 7 Working with a certain duty cycle, VT 4 and VT 8 Working with a complementary duty cycle with dead time, the state-space average equation of the inductor voltage and capacitor current is obtained according to the small-signal modeling method of the DC-DC converter as:

[0075]

[0076]

[0077]

[0078] Among them, V ...

specific Embodiment approach 2

[0086] Specific implementation mode two: Calculate the transfer function G according to the equivalent circuit of the small signal model id (s), G vd (s), G vi (s).

[0087] (3) In forward Boost mode, the input side V 1 Equivalent to the charging side, the disturbance amount on the input side Laplace transform the state-space average equations (1) to (3) of the inductor voltage and capacitor current in the forward boost charging mode, and combine the equation (4) to obtain the duty cycle and the transfer of the inductor current functionG id (s), duty cycle and voltage V 2 The transfer function G vd (s) and inductor current versus voltage V 2 The transfer function G vi (s) are:

[0088]

[0089]

[0090]

[0091] (4) In reverse Buck mode, the input side V 2 Equivalent to the charging side, the disturbance amount on the input side Laplace transform the state space average equations (5) to (7) of the inductor voltage and capacitor current in the reverse Buck...

specific Embodiment approach 3

[0095] Specific implementation mode three: the following combination image 3 and Figure 4 Describe the working principle of the forward Boost mode control system block diagram. The basic control strategy is a double closed-loop control of the voltage outer loop and the current inner loop. The inner loop has two identical branches, each of which has a current loop; the set voltage reference value V ref and the actual output voltage collected by V 2 Compare to get the voltage error V e , the input voltage loop fuzzy PI controller, the PI controller will output the total inductor current reference value I Lref ;Set the total current reference value I Lref After equalization, it is used as the inductor current reference value of the two current inner loops, and the collected inductor current I L1 , I L2 Compare to get the inductor current error I Le1 , I Le2 , input each current loop fuzzy PI controller, and the current loop fuzzy PI controller outputs the driving pulse ...

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Abstract

The invention discloses a fuzzy self-tuning PID control algorithm for an interleaved parallel bidirectional DC / DC converter, and belongs to the technical field of power electronics. The invention provides the fuzzy self-tuning PID control algorithm aiming at the characteristics that the dynamic response speed of a conventional PID control method system is relatively slow and the normal working requirement of an actual power supply system is difficult to meet, and the introduction of fuzzy control enables the dynamic response speed of current and voltage to be faster, the overshoot to be reduced and the current tracking precision to be higher; and aiming at the problem that parameters of each element of an actual working system are difficult to accurately measure, the fuzzy control can ensure the control effect under the condition that the parameters of a controlled system are uncertain. The design of the control process is simple, the response speed of the control system is high, the dynamic characteristic and the static characteristic are good, high stability and robustness are shown, and the control algorithm can be applied to occasions needing electric energy two-way transmission and conversion and the like.

Description

technical field [0001] The invention designs a fuzzy self-tuning PID control algorithm for an interleaved parallel bidirectional DC / DC converter, and belongs to the technical field of power electronics. Background technique [0002] With the development of power electronics technology, power electronic converters have been more and more widely used. In the vehicle-mounted dual power supply systems of freight trucks, DC uninterruptible power supply systems, auxiliary power supply systems in hybrid electric vehicles, mobile power generation systems, new energy grid-connected and energy storage systems, etc., power electronic converters are required to be able to realize two-way electric energy. Transmission and Transformation. In these occasions, due to the advantages of small voltage and current stress, small output voltage and current ripple, low on-state loss, high power density and high reliability, bidirectional DC / DC converters based on synchronous four-switch Buck-Boos...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1582Y02T10/72
Inventor 孟凡刚沈阳高蕾宫大东张伟
Owner HARBIN INST OF TECH AT WEIHAI
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